david works mowing lawns and babysitting. He earns an hour for mowing and an hour for babysitting. How much will he earn for hour of mowing and hours of babysitting?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Which of the following would be a correct step in proving that triangle abc is congruent to triangle cda? a. use a protractor to measure the angles and show that all the corresponding angles are equal in measure. this will allow you to prove congruence by aaa. b. show that segment ab is parallel to segment cd and segment ad is parallel to segment cb. this will allow you to prove congruency by asa. c. show that is segment ab is perpendicular to segment ad. this will allow you to prove congruence by sas. d. none of the above.